However you will need to use lots of pectic enzyme to get rid of the pectin.
Use not teaspoons but table spoons enzyme.
Like 4 to 5 table spoons per batch.
The packaging of the jam tells you how much sugar is contained in every jar or per 100 gram or so.
Do the math and calculate how much sugar you will need for a batch of 5 liter or 10 liter and from that calculate howmany jars of jam you will need.
Adjust acid.
Add nutrients.
Use a strong yeast starter.
Thats about it.
You can use any Jam.
I did strawberry and it was deliscious.
Blackberry will also get good results. Not done that myself but had some of a Belgian winemaker. Really good.
How about giving us a basic recipe to get started on. Like a quart of jam will make a gallon of wine, or does it take 2 or 4 quarts to make a gallon, just something to get us started.